Fig. 4
a Surface marking of the PENG block (standing position): The needle is inserted from lateral to medial in an in-plane approach while the ultrasound probe is positioned to observe the IPE, the iliopsoas muscle and tendon, and the femoral artery. b Pictorial representation of the PENG block (supine position): the needle is inserted from lateral to medial in an in-plane approach while the ultrasound probe is positioned to observe the IPE, the iliopsoas muscle and tendon, and the femoral artery. Abbreviations: ASIS, anterior superior iliac supine, AllS, anterior inferior iliac spine, IPE, ilio-pubic eminence, PT, psoas tendon, FN, femoral nerve, FA, femoral artery, FV, femoral vein